[Insight-users] "Degenerate" 3D registration question

[Bill Lorensen]

I think you said your dataset is 2D? This example is setup to run 3D datasets.

On Mon, Nov 2, 2009 at 8:43 AM, Venkatram Vishwanath
<venkatram.vishwanath.cs at gmail.com> wrote:
> Hello,
> I am looking to register multiple 1024x1024x1 slices and looking for
> suggestions on how one can proceed.
> The application consists of a X-ray machine that rotates around of a 3D
> object(target) along the Y axis and takes 2D images(1024 x 1024) every 10
> degrees. As the target may have moved, we are interested in the registration
> of the various 2D slices followed by volume rendering of the registered
> slices.
> As a starting point, I am looking at the VersorRigid3DTransform example
> (ImageRegistration8.cxx). the example works well with the "brain" sample
> data.
> However, when I run with with my dataset, I get the following error:
> ------------------------------------------
> ExceptionObject caught !
> itk::ExceptionObject (0x1016b2dc0)
> Location: "void itk::RecursiveSeparableImageFilter<TInputImage,
> TOutputImage>::BeforeThreadedGenerateData() [with TInputImage =
> itk::Image<float, 3u>, TOutputImage = itk::Image<float, 3u>]"
> File:
> /Users/venkat/software/ITK/include/InsightToolkit/BasicFilters/itkRecursiveSeparableImageFilter.txx
> Line: 275
> Description: itk::ERROR: RecursiveGaussianImageFilter(0x1016b1c20): The
> number of pixels along direction 2 is less than 4. This filter requires a
> minimum of four pixels along the dimension to be processed.
> ------------------------------------------
> This indicates that I might need to use metrics other than gradient based
> methods.
> Any pointer on how one should proceed would be much appreciated.
> Thanks,
> Venkat
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